Alvarez's penalty was disallowed by the VAR after the slightest double-touch as he slipped. Should it really have been disallowed?

Valverde scored and Real were suddenly 3-1 ahead rather than 2-2 from the spot. Antonio Rudiger eventually scored the final penalty to send Real through 4-2 in the shootout. Whether Alvarez had actually touched the ball with both feet remained a talking point after the game, with initial replays not entirely clear on the matter.